linux-kernel - Re: [PATCH v8 3/6] Uprobes: Support SDT markers having reference count (semaphore)

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Message-ID: <CAPhsuW4ymZAxLdDOAz-rKkyb_POA3ibNW7+2G3BE5Mxtntyqsg@mail.gmail.com>
Date:   Fri, 10 Aug 2018 23:14:01 -0700
From:   Song Liu <liu.song.a23@...il.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Oleg Nesterov <oleg@...hat.com>,
        Ravi Bangoria <ravi.bangoria@...ux.ibm.com>,
        srikar@...ux.vnet.ibm.com, mhiramat@...nel.org,
        Peter Zijlstra <peterz@...radead.org>, mingo@...hat.com,
        acme@...nel.org, alexander.shishkin@...ux.intel.com,
        jolsa@...hat.com, namhyung@...nel.org,
        open list <linux-kernel@...r.kernel.org>,
        ananth@...ux.vnet.ibm.com,
        Alexis Berlemont <alexis.berlemont@...il.com>,
        naveen.n.rao@...ux.vnet.ibm.com,
        linux-arm-kernel@...ts.infradead.org, linux-mips@...ux-mips.org,
        linux@...linux.org.uk, ralf@...ux-mips.org, paul.burton@...s.com
Subject: Re: [PATCH v8 3/6] Uprobes: Support SDT markers having reference
 count (semaphore)

On Fri, Aug 10, 2018 at 12:58 PM, Steven Rostedt <rostedt@...dmis.org> wrote:
> On Thu, 9 Aug 2018 16:38:28 +0200
> Oleg Nesterov <oleg@...hat.com> wrote:
>
>> I need to read this (hopefully final) version carefully. I'll try to do
>> this before next Monday.
>>
>
> Monday may be the opening of the merge window (more likely Sunday). Do
> you think this is good enough for pushing it in this late in the game,
> or do you think we should wait another cycle?
>
> -- Steve

We (Facebook) have use cases in production that would benefit from this work, so
I would rather see this gets in sooner than later. After a brief
review (I will more
careful review before Monday), I think this set is not likely to break
existing uprobes
(those w/o ref_ctr). Therefore, I think it is safe to put it in this cycle.

Thanks,
Song